Read a Quantum Seal without trusting the sender.
Drop a Seal PNG to read its unsigned fields and check its file hash. Everything happens in your browser: the file never leaves your device.
Drop a Quantum Seal PNG
Or click to choose a file. The Seal is read locally in your browser: nothing is uploaded.
Three checks, all local.
A Quantum Seal is a PNG that carries the facts about an envelope. Verification is reading those facts and confirming they hold.
Read the Seal
Open the PNG. Its unsigned metadata fields are plain to read: version, timestamp, algorithm, file hash, and any wallet, x402 or anchor reference.
Match the hash
Hash the .arshield envelope the Seal describes and compare it to the Seal’s file_hash. A mismatch means the file changed after it was sealed.
Confirm with the envelope
The Seal is unsigned, so it cannot prove anything on its own. Its file_hash is only useful once it matches a real envelope — decrypt that envelope to verify the ML-DSA-65 signature against the signer key.
What a Seal states.
Every field is unsigned metadata: it is a description of the envelope, not a claim the Seal proves on its own.
The Seal itself is unsigned. Its value comes from what it lets you check: the file_hash against the envelope, and the wallet against the signature. Anchoring adds a durable reference so the record can be checked again later.